Safety spindle counterbalance



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" March 23 ,1926.

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D. C. KLAUSMEYER SAFETY SPINDLE COUNTERBALANCE Filed April 4, 1923 2SheetsShe'e' 2 20W a y I Qbvwentoz @31 awe mum:

Patented Mar. 23, 1926. v

UNITED STATES PATENT. OFFICE.

DAVID C. KLAUSMEYER, OF CINCINNATI, OHIO, ASSIGNOR TO THE CINCINNATIBICK- FORD TOOL COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

SAFETY SPINDLE GOUNTERBALANCE.

Application filed April 4, 1923. Serial No. 629,852.

To all whom it may concern:

Be it known that I, DAVID 'O. KLAUs- MEYER, a citizen of the UnitedStates, and residing at Cincinnati, in the county of Hamilton and Stateof Ohio, have invented a new and Improved Safety Spindle Counterbalance,of which the following specification is a full disclosure.

This invention relates to drilling machines and it deals primarily withthe means for counterbalancing the weight of the spindle and itsassociated elements whereby the spindle may be readily moved up and downfor the purpose of feeding'the drill into and out of the work; all Whilepermitting the spindle to rotate.-

Heretofore, it has been usual to employ a weight for the purpose ofcounterbalancing that ofrthe spindle and it has, accordingly, beennecessary to provide space in or adjacent the frame of the machine toac.

commodate the movement of the weight. Furthermore, when a weight isemployed, it has to be of suitable proportions and means must beprovided .for so that thepath of the weight will not be in theimmediateproximity of the. spindle; all of which. has entailed somestructural objections. Furthermore, the employment of a weight does notmake it possible easily to adjust the de-' gree of the counter-pull onthe spindle to meet any particular circumstances of use.

This invention, accordingly, undertakes to render available a 'verycompact and selfcontained arrangement suitable for the suspension of adrill-spindle and in which a weight is dispensed with and its functionsperformed by a coiled spring preferably located. in an upper portion ofthe frame away from the working region of the spin- 2 die. Anotherobject of the invention is to combine with the spindle-supporting-meansa safety device such that, if the spindle should fail to be supported,the device will operate forthwith to arrest any untoward descent of thespindle.

Another object is so to construct the spring arrangement that the pullon the spindle will be uniform notwithstanding the increase in' thetension of the spring when the spindle is in its lower positions;thereby avoiding an objection heretofore raised to the use of springsdue to their inability to exactly counterbalance the spindle in all ofits positions.

Another object is to provide a very con-- venient means for adjustin thedegree of tension of the spring or for replacing a broken part or formaking any other correction necessary to the mechanism. This has alwaysoccasioned much trouble in the and in part rendered apparent therefromin connection with the annexed drawings.

To enable others skilled in the art so fully to apprehend the underlyingfeatures hereof that they may embody the same in the various wayscontemplated by this invention, drawings depicting a preferred typicalconstruction have been annexed as a part of this disclosure and, in suchdrawings, like characters of reference denote corresponding partsthroughout all the views, of which Fig. 1 is a vertical section takentransversely to that of Fig. 2 showing in sideelevationthecounter-balancing device and the safety catch. Fig. 2 is a verticalsection of a portion of a drilling machine embodying this inventionshowing a clutch ar rangement enabling the drill spindle to begencycheck to prevent falling of the drill spindle. Fig. 6 is an enlargedfragmentary will be in part indicated in the following-description sideelevation of said emergency check and pawl. Referring'to thedrawings, 1represents a portion of the frame of a drill head which, in thisinstance, is provided with guideways 2 and 3 to admit of being shiftedbodily along a radial arm or other suitable support. This head l'has avertical hole within which is vertically shiftable a sleeve 4. Thissleeve does not rotate but may be translated by means of a pinion 1.7engaging a rack 16 afiixed-to one side of the spindle. The pinis a frontelevation of the-isolated that the power may be engaged with the withthe spindle as to receive the weight ofpinion 17 ,the hand-lever 34: maybe turned about its pivot thereby'shifting the cam 37 and the pin 38which controls the clutch. A stop 44: adapted to cooperate with the part45 on the hand-lever 34; automatically disconnects the power-feed at anadjusted position and a stop cooperating with a shift-key 4:1accomplishes the same effect at the limit of. the downward stroke of thespindle.

The sleeve 4, which is vertically translatable as aforesaid in the frame1, carries the spindle 3 which is journaled therein and is restrainedagainst longitudinal movement relative to the sleeve by means ofthrustbearings 5 and 14; the former cooperating with a shoulder providedby the spindle and the latter with an adjustable collar 15, as will beunderstood.

The weight of the parts is sustained or counterbalanced, withoutinterfering with the vertical movement, by means of a flexibleconnection here shown as a link-chain 30. This chain is at one end soconnected the parts and, at its. other end, the chain is connected witha pull-device adapted to ex.- ercise sufficient tension on the chaintocounterbalance the downward drag of the spindle and its associatedparts. A convenient form of attachment is that shown best by Fig. 1 inwhich a plate 6 is firmly secured to the upper portion .of the sleeve 4and this plate has a projecting portion 7, the extremity of whichisrbifurcated to straddle a stationary ratchet-bar 11 havingratchet-teeth 13. It will be seen that, by this arrangement, the sleeveand rack attached thereto are prevented fromturning by reason of theengagement between the projecting portion 7 and the stationaryratchet-bar 11.- Heretofore the sleeve has been restrained from turningby a stationary projection which, so to speak, had a movement along thesleeve during its rise and descent. Bv virtue of the presentarrangement, the sleeve is thus made available for the use of anadditional stop which is complementary in action to theabove describedstop ,40. It willbe understood that,

" when the spindle ,is merely reversed in direction of rotation,-itsdirection of feed is likewise reversed and the effect of stop 55 is toprevent the spindle from being overfed upwardly. .In priorconstructions, the

7 and is urged by a spring 10 towards the ratchet-teeth 13; the objectbeing to effect an immediate and automatic engagement between the pawl 9and the ratchet-bar 11' in the event that the tension connection 30either breaks or, for some reason or other, fails to be pulled upwardlywith a force sufficient to sustain the weight of the spindle and sleeve.embodiment by providing the pawl 9 with a short arm to which ispivotally attached the lower end of the chain 30. Therelation betweenthe pivot 8 and the point of attachment of the chain is such that whenthe chain exercises suflicient pull it will hold the pawl 9 into itsretracted position and out ofcngagemcnt with the teeth'13. If thetension should be insufiioient, however, the spring 10 will be enabledto act and the pawl This is accomplished, in this 9 will prevent any"downward movement of the sleeve 4. It will beseen that this safetycatcharrangement is equally applicable whether the tension ,on the chain 30be created by an ordinary counterbalancing weight or by the compactsprmg-mechamsm constituting another characteristic of this invention andwhich will now be described.

Preferably the axis of the pin 46 is normally offset with relation tothe axis of the naled in an upper portion 22 of the frame is a stud 23which, at one end carries a worm 21 permanently in mesh with the'worm-Wheel 20 and. this stud 23 may be turned by hand by applying awrench to the squared end 31; thereby enabling the angular position ofthe shaft 18 to be regulated from the point 21. This being anirreversible drive, .it will be apparent that any tendency'of the shaft18 to turn will be restrained by the worm 21 in allpositions, althoughany rotation of the stud 23 will at once effect a corresponding movementin, the shaft 18. The purpose of this arrangement is to enable acounterbalancin -spring to have its tension adjusted to. any desirabledegree. This spring is shownby Fig. 3 and i attached to the shaft 18 bymeans of a pin mg elements such as the Weight heretofore employed. Also,the invention presents a 19. The spring 24 is contained within .arotatable housmg 26; it bein attached thereto-by means of a hooked en 25engage ing a slot in the peripheral Wall of the housing, as shown byFig. 1. The housing 26 is also attached to a member shown by; Fig.

4'which is in the nature of a fusee and on the periphery of which windsthe chain 30. The periphery of the fusee 27 provides a shallow groove 28and this groove is of spiral formation so that it progressively1nci'eases in distance from the axis of rotation of the fusee. The chainis attachedat one end to the end of the groove 28 which is most remotefrom the axis of rotation, as by means of'a in 29. f

It will be perceived that, in consequence of this arrangement, as thespindle is lowered, and as the spiral spring 24 increases in tension,the-po1nt on which the chain leaves its drum willbe more and more remotefrom the axis of rotation; in other.

words, the leverage efi'ect will progressively decrease as the tensionof the .spring increases and conversely. In this manner, the chain 30 issubjected to a constant tension in all positions of the spindle althou hthe spiral spring has its tension increase as it becomes wound more andmore tightly.

It will be perceived that this invention provides a very compactself-contained arrangement, eminently suitable for drilling machines,and which removes from the proximity of the spindle any spaceoccupydegree of safety not heretofore attalned in asmuch as it isimpossible for the spindle or sleeve to fall even though the meansnormally supporting it should fail and, further more, in the event ofsuch a failure, it is'a very simple matter to make repairs inas-- muchas the connections are immediately accessible and such connections maybe estabished undereasy working conditions, to wit, when there is notension on any of the parts; the means for re ulating the tension .ofthe spring being capa le of reducing that tension to zero or ofincreasing it to any desired amount after the connection has beenestablished.

Without further analysis, the foregoing will so fully reveal the gist ofthisinvention that others can, by applying current knowledge, readilyadapt it for various essential characteristics of either the generic incase said counter.-

pally-movable spindle; quick-traverse means therefory. a fusee connected-to carry the weight of said s'pindle;.a coiled spring exer-v cising acounter-pull on said fuses; and a safety-latch means for said spindlenormally held inoperative'b the connection between the fusee and spmdleand adapted automatically to arrest the descent of said spindle ullshould cease.

me combininga spindle; a sleeve having a rack; a pinion engagin saidrack; means for turnin said pinion eit er manually to effect a quic-traverse of said sleeve or y power to feed said sleeve; a coiled-springfor counter-balancin said parts; a planar compensator intervening be- 12. A drilling-mac tween said sprin and said parts for rendersleeve; acoiled-spring for counter-balancmg said sleeve and spindle; a planarpullequalizer intervening between said spring and said sleeve forrendering uniform and maintaining in the same plane the pull of saidsringv on said spindle; manual means for a justm the normal tension ofsaid spring; a me carried by said sleeve; means cooperating with saidrack for shifting said sleeve either quickly manually or slowly bypower; and 21 safety-catch comprising a spring pressed pawl'mounted'directly on said sleevev to cooperatew/ith a fixed rack forautomatically arresting the fall of said spindle in'case it should failto receive suport from said spring, whenever the power eeding means isdisengaged;

In witness-whereof, I hereunto subscribev y name. utihzatlons byretaining one or more of the r" a DAVID o. musMEYER.

